Dictionary![]() ![]() he•li•oPronunciation: (hē'lē-ō"), [key] —n., —pl. -li•os. Informal. 1. a heliogram. 2. a heliograph. helio-a combining form meaning “sun,” used in the formation of compound words: heliolatry. Also, esp. before a vowel,heli-. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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